diff options
Diffstat (limited to 'src/gui/kernel/qapplication_mac.mm')
| -rw-r--r-- | src/gui/kernel/qapplication_mac.mm | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/gui/kernel/qapplication_mac.mm b/src/gui/kernel/qapplication_mac.mm index c7d0e48..28072fc 100644 --- a/src/gui/kernel/qapplication_mac.mm +++ b/src/gui/kernel/qapplication_mac.mm @@ -1759,14 +1759,19 @@ QApplicationPrivate::globalEventProcessor(EventHandlerCallRef er, EventRef event // (actually two events; one for horizontal and one for vertical). // As a results of this, and to make sure we dont't receive duplicate events, // we try to detect when this happend by checking the 'compatibilityEvent'. + // Since delta is delivered as pixels rather than degrees, we need to + // convert from pixels to degrees in a sensible manner. + // It looks like 1/4 degrees per pixel behaves most native. + // (NB: Qt expects the unit for delta to be 8 per degree): + const int pixelsToDegrees = 2; SInt32 mdelt = 0; GetEventParameter(event, kEventParamMouseWheelSmoothHorizontalDelta, typeSInt32, 0, sizeof(mdelt), 0, &mdelt); - wheel_deltaX = mdelt; + wheel_deltaX = mdelt * pixelsToDegrees; mdelt = 0; GetEventParameter(event, kEventParamMouseWheelSmoothVerticalDelta, typeSInt32, 0, sizeof(mdelt), 0, &mdelt); - wheel_deltaY = mdelt; + wheel_deltaY = mdelt * pixelsToDegrees; GetEventParameter(event, kEventParamEventRef, typeEventRef, 0, sizeof(compatibilityEvent), 0, &compatibilityEvent); } else if (ekind == kEventMouseWheelMoved) { |